+/* Directories clang will search for headers */
+#define C_INCLUDE_DIRS "${C_INCLUDE_DIRS}"
+
+/* Directory clang will search for libstdc++ headers */
+#define CXX_INCLUDE_ROOT "${CXX_INCLUDE_ROOT}"
+
+/* Architecture of libstdc++ headers */
+#define CXX_INCLUDE_ARCH "${CXX_INCLUDE_ARCH}"
+
+/* 32 bit multilib directory */
+#define CXX_INCLUDE_32BIT_DIR "${CXX_INCLUDE_32BIT_DIR}"
+
+/* 64 bit multilib directory */
+#define CXX_INCLUDE_64BIT_DIR "${CXX_INCLUDE_64BIT_DIR}"
+